Lesser-Known Hollywood Siblings

Shannon Leto

Famous sibling: Jared Leto

When Jared Leto won an Academy Award for his performance in "Dallas Buyers Club," his brother and "best friend" Shannon Leto was among the people he offered his greatest thanks. The siblings are also bandmates in the rock group Thirty Seconds to Mars. —XFINITY Entertainment Staff (Photo by Kevork Djansezian/Getty Images)

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These people aren't who you think they are. In fact, they are the lesser-known siblings of super-famous celebrities. Who are they? Discover the hidden branch of more than 40 Hollywood family trees ahead. —XFINITY Entertainment Staff (Photos by Getty Images)

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Is that a third Olsen twin? Not quite. Liz Olsen, the founder and fashion designer of "ethical footwear" for vegans, is the younger sister of the "Full House" stars. Elizabeth recently exploded as a major Hollywood player after her performances in "Martha Marcy May Marlene" and "Silent House." Olsen recently appeared in "Kill Your Darlings," "Oldboy," "Godzilla" and has joined the all-star cast of the 2015 movie "The Avengers: Age of Ultron." —XFINITY Entertainment Staff (Photo by Theo Wargo/Getty Images)

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The oldest Hemsworth brother, Luke, was the first to break into showbiz. The hunky Hemsworths all got their starts on Australian soaps—Luke appeared in "Neighbours," his youngest brother Liam followed suit with a stint on the same show, while Chris worked on another long-running Aussie soap "Home & Away." —XFINITY Entertainment Staff (Photo by Aaron Harris/Getty Images)

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"The Social Network" star's little sister is something special, actually. Remember those late-'90s Pepsi commercials with the dimple-faced girl who kindly squeaked, "I'll have a Pepsi, please"? That's this girl! She last appeared in her big brother's film "Holy Rollers," which was released in 2010. —XFINITY Entertainment Staff (Photo by Andrew H. Walker/Getty Images)

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James' little brother Dave is also an actor, barely known for his roles on "Privileged" and the last season of "Scrubs." He most recently appeared in "Now You See Me" and "Neighbors," and will star in the upcoming film "Unfinished Business." —XFINITY Entertainment Staff (Photo by Frederick M. Brown/Getty Images)

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Like her older sister, cute-as-a-button Elle is impressing critics in films such as "The Curious Case of Benjamin Button," "Super 8" and "Somewhere." She recently starred in her biggest role to date, starring as Princess Aurora in Disney's "Maleficent." —XFINITY Entertainment Staff (Photo by Jason Merritt/Getty Images)

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When Jared Leto won an Academy Award for his performance in "Dallas Buyers Club," his brother and "best friend" Shannon Leto was among the people he offered his greatest thanks. The siblings are also bandmates in the rock group Thirty Seconds to Mars. —XFINITY Entertainment Staff (Photo by Kevork Djansezian/Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Lindsay's little sister has been able to fly under the radar for years, but with parents like Dina and Michael Lohan, trouble may be brewing for Lilo's younger sis. The 21-year-old recently announced plans to launch a music career. —XFINITY Entertainment Staff (Photo by Bryan Bedder/Getty Images)

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Dannii is popular overseas, where she's known as a singer, actress, TV personality, radio personality, model and fashion designer. But in the United States, it's her pop star sister Kylie who is the top Minogue. —XFINITY Entertainment Staff (Photo by Brendon Thorne/Getty Images)

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The brother of late "SNL" star Chris Farley is also an actor, and has appeared in movies such as "The Waterboy," "Joe Dirt" and "Eight Crazy Nights." —XFINITY Entertainment Staff(Photo by Michael Buckner/Getty Images)

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Good genes must run in the Kidman family, which produced Nicole and her little sister Antonia, who is a Singapore-based journalist. —XFINITY Entertainment Staff (Photo by Lisa Maree Williams/Getty Images)

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Alex is just one of six siblings (three half, two step and one full) to the "Harry Potter" actress. Alex, the only full-blooded sibling, has appeared as an extra in two "Potter" films. He recently modeled for a Burberry campaign. —XFINITY Entertainment Staff (Photo by Ian Gavan/Getty Images)

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Besides that winning, dimpled smile, the Garner sisters don't have much in common. Susannah (younger) and Melissa (older) are not in show business. —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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It's not easy living up to one of the most famous women in the U.K. (especially when your faces look so similar), but lucky for Posh's little sister Louise, she's found a niche as the owner of a high-end fashion store called "The Closet." Ever wonder where Beckham gets her fabulous wardrobe? —XFINITY Entertainment Staff (Photo by Gareth Cattermole/Getty Images)

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Though not as famous as her sister, Kelly's work has touched far more lives than "Basic Instinct." As co-founder (with Sharon) of a non-profit charity called Planet Hope, Kelly helps bring hope to homeless and abused children, as well as their families. —XFINITY Entertainment Staff (Photo by Alberto E. Rodriguez/Getty Images)

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Gwyneth's little brother isn't awfully well-known. As a director, Jake's most notable works have been episodes of "NYPD Blue" and a 2007 indie film called "The Good Night," which starred his big sis. He recently followed in his writer/director father's footsteps by penning and directing "Young Ones." —XFINITY Entertainment Staff (Photo by Andrew H. Walker/Getty Images)

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Who knew Jenny from the block had a younger sister from the block? Folks in the New York-New Jersey area may recognize Ly-Lo from her stints on local radio, as well as TV broadcasts "Good Day New York" and "Fox 5 Live." —XFINITY Entertainment Staff (Photo by Mike Moore/Getty Images)

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Say you, say me. Say, isn't Lionel Richie's youngest kid just adorable? Sofia is the product of Richie's second marriage and is not blood-related to Nicole, who was adopted by Richie and his first wife. Sofia currently appears on her sister's reality series "Candidly Nicole." —XFINITY Entertainment Staff (Photo by Jason Merritt/Getty Images)

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Eddie's older brother is an actor and comedian who was best known as a cast member on "Chappelle's Show." Today, Charlie can be seen in the comedy series "Black Jesus." —XFINITY Entertainment Staff (Photo by Alberto E. Rodriguez/Getty)

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The uniquely named Phoenix clan also includes a half-brother name Jodean. All three sisters have dabbled in acting, but have also collaborated on music projects together. Summer Phoenix is married to Casey Affleck. —XFINITY Entertainment Staff (Photos by Bryan Bedder, John Shearer/Getty Images)

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This guy is the spitting image of Napoleon Dynamite himself, and for good reason — it's his twin brother! Jon and Dan also have an older sister and brother, as well as two younger brothers. —XFINITY Entertainment Staff (Photo by Vince Bucci/Getty Images)

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The older brother of Britney and Jamie Lynn wasn't a pop star and wasn't a pregnant teen, but he is reportedly a co-trustee of Britney's assets and married to Jamie Lynn's agent. Way to go, Bryan! —XFINITY Entertainment Staff (Photo by Dave Hogan/Getty Images)

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There is no shortage of talent in the Cusack family. John Cusack most recently starred as Edgar Allen Poe in "The Raven," while Joan ("Shameless") and Ann ("Frasier") Cusack have enjoyed successful acting careers of their own.

Lesser-known Cusack brother Bill has appeared in bit parts in several of John's films, including "Grosse Pointe Blank," "Con Air" and "War, Inc." The siblings also have another sister named Susie. —XFINITY Entertainment Staff (Photo by Frazer Harrison/Getty)

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You're probably aware of James Haven's existance, but it certainly isn't for all the right reasons. James and his little sister sparked controversy at the 2000 Academy Awards when their unusual displays of affection sparked incest rumors across the media. Talk about brotherly love. —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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Brandi (left) and Trace (top middle) are older half-siblings, as is another brother Christopher Cody (not pictured). Braison (right) and Noah (bottom middle) are full-blooded younger siblings to Miley. All of them are somehow involved in acting, music or both. Trace is the vocalist and guitarist for the band Metro Station. —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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He is down, but he is far from over. Frank scored a top 10 hit with the 1983 song "Far From Over," and went on to record 10 studio albums. He still performs today, and also appears on TV and in the movies. He recently had a role in Sly's film "Reach Me." —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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Charlie has appeared in a few of his big brother's projects, but he's best known for his reality TV role as single guy searching on the seventh season of "The Bachelor." —XFINITY Entertainment Staff (Photo by Frazer Harrison/Getty)

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Yes, there is a fourth Jonas brother. Also known as the "Bonus Jonas," little Frankie has a lot to live up to. How would you like to be the only kid in your family who isn't in the hottest boy band in the entire world? —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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We're guessing Thanksgivings at the Ciccone house are uncomfortable occasions. How would you react if your little brother wrote an unflattering tell-all book about you? —XFINITY Entertainment Staff (Photo by Alberto E. Rodriguez/Getty Images)

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We're not entirely sure what former "Hills" star Audrina Patridge's sister Casey does for a living, but Google searches suggest modeling, Twittering and occasional blogging. She also has a sweet T-Rex tattoo on her side. —XFINITY Entertainment Staff (Photo by Frederick M. Brown/Getty Images)

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Most singers pale in comparison to Beyonce, and her little sister is no different. Sasha Fierce's baby sis has tried her hand at both music and acting. Neither careers have taken off... yet. Maybe she should pursue a career in mixed martial arts, right, Jay Z? —XFINITY Entertainment Staff (Photo by Christopher Polk/Getty)

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As is the case with their older sister Paris, what these Hilton kids actually "do" (besides get into trouble) is debatable. —XFINITY Entertainment Staff (Photos by Ian Gavan/Getty Images; Kevin Winter/Getty Images)

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You may not know AnnaLynne unless you watch (or have a teen that watches) "90210," so you've definitely never met her little sis Rachel or big sis Angel, who are both aspiring actresses. Behold them here, in rare non-bikini pictures. —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

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The closest to fame Kirsten's little brother gets is escorting his sister down the red carpet. Can you get paid for that? —XFINITY Entertainment Staff (Photo by Bryan Bedder/Getty Images for Max Azria)

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What do you do when you're the less-famous brother of a former "SNL" cast member? Join "Mad TV," of course. And that's exactly what Josh did. —XFINITY Entertainment Staff (Photo by Ethan Miller/Getty Images)

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He's appeared in projects along side his older brothers, but Andy never gained the same popularity as Joey ("Blossom") and Matthew ("Mrs. Doubtfire"). Whooa! —XFINITY Entertainment Staff (Photo by Jason Merritt/Getty Images)

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